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gc: print detail for typechecking loop error

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R=ken2
CC=golang-dev
https://golang.org/cl/5654060
This commit is contained in:
Russ Cox 2012-02-11 01:04:33 -05:00
parent 2f3d695a61
commit 2aafad25b4
1 changed files with 48 additions and 11 deletions
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59
src/cmd/gc/typecheck.c
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@ -111,16 +111,15 @@ typekind(Type *t)
* replaces *np with a new pointer in some cases.
* returns the final value of *np as a convenience.
*/
static void typecheck1(Node **, int);
Node*
typecheck(Node **np, int top)
{
int et, aop, op, ptr;
Node *n, *l, *r;
NodeList *args;
int lno, ok, ntop;
Type *t, *tp, *ft, *missing, *have, *badtype;
Val v;
char *why;
Node *n;
int lno;
Fmt fmt;
NodeList *l;
static NodeList *tcstack, *tcfree;
// cannot type check until all the source has been parsed
if(!typecheckok)
@ -157,11 +156,52 @@ typecheck(Node **np, int top)
}
if(n->typecheck == 2) {
yyerror("typechecking loop involving %N", n);
if(nsavederrors+nerrors == 0) {
fmtstrinit(&fmt);
for(l=tcstack; l; l=l->next)
fmtprint(&fmt, "\n\t%L %N", l->n->lineno, l->n);
yyerror("typechecking loop involving %N%s", n, fmtstrflush(&fmt));
}
lineno = lno;
return n;
}
n->typecheck = 2;
if(tcfree != nil) {
l = tcfree;
tcfree = l->next;
} else
l = mal(sizeof *l);
l->next = tcstack;
l->n = n;
tcstack = l;
typecheck1(&n, top);
*np = n;
n->typecheck = 1;
if(tcstack != l)
fatal("typecheck stack out of sync");
tcstack = l->next;
l->next = tcfree;
tcfree = l;
lineno = lno;
return n;
}
static void
typecheck1(Node **np, int top)
{
int et, aop, op, ptr;
Node *n, *l, *r;
NodeList *args;
int ok, ntop;
Type *t, *tp, *ft, *missing, *have, *badtype;
Val v;
char *why;
n = *np;
if(n->sym) {
if(n->op == ONAME && n->etype != 0 && !(top & Ecall)) {
@ -1484,10 +1524,7 @@ error:
n->type = T;
out:
lineno = lno;
n->typecheck = 1;
*np = n;
return n;
}
static void